AMP-SG-M1 miniature strain gage amplifier, wired connections

Miniature single-channel strain gage amplifier with hook-up wires, 31.75 × 20.32 × 6.35 mm, ± 10 V output, placed on the rotating side before the slip ring.

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AMP-SG-M1 datasheet (PDF) All resources

14.17 g: Weight
100 to 2000 V/V: Gain
± 10 V: Output
20 kHz: Frequency response, −3 dB

Bridge excitation± 2.5 V or ± 5 V
Supply voltage± 15 V DC
Dimensions31.75 × 20.32 × 6.35 mm
Operating temperature−40 to 125 °C

One bridge, amplified on the rotating side

The AMP-SG-M1 is a miniature single-channel strain gage amplifier, designed to amplify the signal before it passes through a slip ring. It holds a low-drift bipolar bridge excitation supply, ± 2.5 V (AMP-SG-M1-5) or ± 5 V (AMP-SG-M1-10), a low-noise differential amplifier and a 100 kΩ or 1 MΩ shunt calibration resistor, switched remotely in either direction. Gain is set from 100 to 2000 V/V, the output reaches ± 10 V and the response is 20 kHz at −3 dB. It runs on ± 15 V DC, measures 31.75 × 20.32 × 6.35 mm, weighs 14.17 g and operates from −40 to 125 °C.

The amplifier is bonded to a clean surface with Dow Corning 3145 RTV, taking care not to cut its color-coded hook-up wires, and handled as an electrostatic sensitive device. It needs a full strain gage bridge to regulate the excitation. Shorting the gain wires gives 2000 V/V, leaving them open 100 V/V, and a resistor sets any gain between; the shunt wires work the same way. A PS Series power supply provides the ± 15 V, turns the bridge excitation off by reversing polarity and applies positive or negative shunt calibration.

It is used on the rotating side, ahead of the slip ring, to measure accessory belt pulley torque on an engine, crankshaft torque on a running engine and prop shaft torque.

Specifications

Channels	1
Input	Strain gage bridge (full bridge)
Output	Analog voltage
Output range	−10 to 10 V
Bandwidth	20 kHz (−3 dB, gain 100 and 1000)
Noise, referred to input	≤ 0.7 µV (p-p, 0.01 to 10 Hz)
Gain	100 to 2 000 V/V (100 or 2000 by jumper, any value between by external resistor)
Gain setting	Jumper · External resistor
Shunt calibration	Positive · Negative · Remote
Shunt resistor	100 · 1 000 kΩ (internal; 100 kΩ to 1 MΩ external)
Gain accuracy	≤ 0.5 % (typical: 0.05 % at gain 100, 0.50 % at gain 1000)
Gain temperature coefficient	≤ 0.0025 %/°C
Input offset	≤ 50 µV (10 µV typical)
Offset drift	≤ 0.1 µV/°C (typical; 0.1 µV/month)
CMRR	160 dB
Slew rate	4 V/µs
Settling time	9 µs (gain 100)
Shunt accuracy	≤ 0.1 %
Supply voltage	15 V (dual supply, ± 15 V DC)
Excitation voltage	5 to 10 V (± 2.5 V on AMP-SG-M1-5, ± 5 V on AMP-SG-M1-10, bipolar DC constant voltage; remote on/off)
Supply current	15 mA (per rail, plus bridge load; + 15 mA during shunt calibration)
Excitation current limit	42 mA (84 mA on AMP-SG-M1-10)
Max capacitive load	1 000 pF
Excitation accuracy	≤ 0.4 %
Excitation temperature coefficient	≤ 0.0005 %/°C
Dimensions	31.75 × 20.32 × 6.35 mm
Weight	14.17 g
Operating temperature	−40 to 125 °C
Compensated temperature	−40 to 85 °C